Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs
The investigation of the programmed current source for the beam scanning system has shown the possibility of flexible regulation of characteristics of electron beams at a linac exit.
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| Veröffentlicht in: | Вопросы атомной науки и техники |
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| Datum: | 1999 |
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Національний науковий центр «Харківський фізико-технічний інститут» НАН України
1999
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| Zitieren: | Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs / V.N. Boriskin, L.V. Reprintsev, V.I. Tatanov, G.M. Tsebenko // Вопросы атомной науки и техники. — 1999. — № 3. — С. 64-65. — Бібліогр.: 3 назв. — англ. |
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Boriskin, V.N. Reprintsev, L.V. Tatanov, V.I. Tsebenko, G.M. 2015-05-14T21:01:25Z 2015-05-14T21:01:25Z 1999 Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs / V.N. Boriskin, L.V. Reprintsev, V.I. Tatanov, G.M. Tsebenko // Вопросы атомной науки и техники. — 1999. — № 3. — С. 64-65. — Бібліогр.: 3 назв. — англ. 1562-6016 https://nasplib.isofts.kiev.ua/handle/123456789/81375 The investigation of the programmed current source for the beam scanning system has shown the possibility of flexible regulation of characteristics of electron beams at a linac exit. en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs Разработка и исследования режимов работы программируемого источника тока для сканирующего магнита технологических линейных ускорителей электронов Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| title |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| spellingShingle |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs Boriskin, V.N. Reprintsev, L.V. Tatanov, V.I. Tsebenko, G.M. |
| title_short |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| title_full |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| title_fullStr |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| title_full_unstemmed |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| title_sort |
development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs |
| author |
Boriskin, V.N. Reprintsev, L.V. Tatanov, V.I. Tsebenko, G.M. |
| author_facet |
Boriskin, V.N. Reprintsev, L.V. Tatanov, V.I. Tsebenko, G.M. |
| publishDate |
1999 |
| language |
English |
| container_title |
Вопросы атомной науки и техники |
| publisher |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| format |
Article |
| title_alt |
Разработка и исследования режимов работы программируемого источника тока для сканирующего магнита технологических линейных ускорителей электронов |
| description |
The investigation of the programmed current source for the beam scanning system has shown the possibility of flexible regulation of characteristics of electron beams at a linac exit.
|
| issn |
1562-6016 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/81375 |
| citation_txt |
Development and study of the operation made of a programmed current source for scanning electromagnet of technological electron linacs / V.N. Boriskin, L.V. Reprintsev, V.I. Tatanov, G.M. Tsebenko // Вопросы атомной науки и техники. — 1999. — № 3. — С. 64-65. — Бібліогр.: 3 назв. — англ. |
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2025-11-25T20:39:25Z |
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2025-11-25T20:39:25Z |
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| fulltext |
DEVELOPMENT AND STUDY OF THE OPERATING MADE OF A
PROGRAMMED CURRENT SOURCE FOR SCANNING
ELECTROMAGNET OF TECHNOLOGICAL ELECTRON LINACS
V.N.Boriskin, L.V.Reprintsev, V.I.Tatanov, G.M.Tsebenko
NSC KIPT, Kharkov, Ukraine
Technological electron linacs are equiped by
electron beam-scanning systems at the accelerator exit
which create of a demanded radiation special zone [1].
The electromagnet of the scanning system is placed at
the linac disposed in the bunker. It is energized from the
source of the current, situated in the operator panel and
connected with the electromagnet by a feeder (its length
is 80 m). The source of the current is the powerful low-
frequency amplifier (PA), which is energized by the
scan voltage formed in the drive generator (AG). Three-
phase rectifier provides a power supply for the device.
Main technical features of the scanning system [3] are
shown in the Table 1.
Table 1
Swing of output current ±30 A
Scan frequency 3,0 Hz +3%
Minimum swing of current ± 5 A
r out of amplifier 0,18 Ω
Increase in velocity of an impulse
front
1 ms
Load parameters of electromagnet r м = 0,12 Ω
lм = 9,3 mH
Two drive generators have been device for the
current source of the scanning system. The analog AG
gives a possibility for the accelerator can work with
linear scanning and the numerical AG allows one to
program a scan voltage form for the research and
special work [2]. Now we will briefly remind a
composition and structure of the numerical AG. Device
reads numerical code from his read only memory
(ROM) in cycle and convert it into the scan voltage
signal. The numerical AG contains adjusting cascades
and ensures a matching with PA, as well as work in the
mode on-line within the automatic linac control system.
Fig.1 represents the block- scheme of numerical AG.
Fig. 1. 1. Pulsing generator, 2. ROM address register,
3. PROM, 4. DAC, 5. Adder for signals from two
channels, 6. 7. Buffer cascades.
Parameters numerical AG are provided in table 2.
Table 2
Frequency scan range 0,5 ÷ 5 Hz
Voltage amplitude AG ± 28 V
Number of levels of amplitude 256
Number of spots in the scan half-
time of one polarity
128
Number of channels defining the
voltage scan form
2
Amount of programs in memory 16
The experimental stand with the real source of
the current and load-magnet-scanner without the long
feeder line was collected for the simulation of the
different work regimes and their reset (Fig.2).
Fig.2. Simplified equivalent scheme of output cascade
of the scan block with load elements (in the top);
scheme for calculation of the relation between Uout and
current of the magnet-scanner (in the bottom).
Uin is the voltage created by the drive generator at the
input resistor of the output cascade, Uout is the output
voltage of the scan block, K is the voltage transmission
coefficient, rf- is the feeder resistance, Mska is the
magnet-scanner, Lm is the magnet winding inductance,
rm is the winding resistance, ri is the measuring resistor,
E is e.m.f. of the detector recording the speed of
changes of the magnetic field dH/dt, rout is the output of
resistor.
Usually one uses the low frequency (of the order
of magnitude of several Hz) for scanning the electron
beam. Therefore, it is possible to represent the scanning
magnet as a consequent connection of an inductance and
active resistor. Then we can write an equation,
connected output voltage with the magnet winding
current:
dt
dilrrrriU m
mimfoutmout ∗++++∗= )( . (1)
If we introduce the efficient resistance of the output
circuit ref=rout+rf.+rm+ri, then (1) will look like:
dt
rid
TriU efm
efefmout
)( ∗
∗+∗= , (2)
where
ef
m
ef r
lT = is the efficient time constant of the
magnet. In our case the density distribution of the
electron beam defines the time dependence of the
magnet field H(t) (and, respectively, of the current iM(t).
If the output voltage is represented as the sum of two
components 21 UUU out += , where
dt
dUTU ef
1
2 ∗= ,
then the magnet circuit current is determined, according
to relation (2), only by the component U1=IM⋅ref and
initial conditions ( ) ( ) efm riU ∗= 001 at t=0. The optimal
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. №3.
Серия: Ядерно-физические исследования. (34), с. 64-65.
64
relation between U2 and U1 essentially depends on the
ratio
T
Tef (T is the time of the half-cycle of the scan)
and requires the changing with modification of the beam
scanning frequency.
The special regime was created in the described
scan block for ensuring measurement of the value ml ,
efT outr
,
mr under conditions similar to a basic
operating mode. For this the output voltage outU was
formed in the manner of two polar rectangular pulses of
a length near 500 ms (Fig.3c), that ensured a switching
of the magnet-scanner from the mode with the current
0I− in the mode with the current 0I+ . The data on the
transitional process for current mi and the voltage on
the magnet terminals allow to get the above mentioned
values. In result of measurements it was obtained:
4,27=ml mH, 165,0=+ im rr Ω, 17,0=outr Ω,
82=efT ms, when 05,0=ir Ω and 0=fr . It is
necessary to note here that the measurements of the
magnet-scanner inductance with the core plates of a 2
mm thick at frequency 50 Hz give the values essentially
less of that above mentioned. But the similar
measurements at the frequency of the measuring bridge
(1000 Hz) give the values which differ from working
values in several times. The regime of the beam
scanning for the linear scan (Fig. 3a) and the regime, in
which the center target area got the doze less than the
target edges (Fig. 3b), were calculated and programmed
after refinement of the parameters of system elements.
The results of the experimental check have been
introduced on the signal oscillogramms: inU , outU
amplifier, magI and detector dtdH .
0
5
10
15
20
25
30
0 100 200 300 400
V
U in
mS
-5
0
5
10
15
20
25
30
0 200 400 600 800 1000
U in
mS
V
0
2
4
6
8
10
12
14
16
0 100 200 300 400 500 600
V
m S
U in
0
2
4
6
8
10
12
0 100 200 300 400
V
U out
mS
-1
-0.5
0
0.5
1
1.5
2
2.5
3
0 200 400 600 800 1000
U oui
V
mS
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 200 400 600
V
mS
U out
0
2
4
6
8
10
12
14
0 100 200 300 400
mV
mS
I маg
0
10
20
30
40
50
60
70
0 200 400 600 800 1000
I mag
mS
mV
0
10
20
30
40
50
60
70
80
90
100
-100 100 300 500 700
mV
I mag
mS
0
5
10
15
20
25
30
35
40
0 100 200 300 400
mV
mS
dH/dt
-100
-50
0
50
100
150
0 200 400 600 800 1000
dH/dt
mS
mV
0
20
40
60
80
100
120
140
160
180
200
0 100 200 300 400 500
mV
mS
dH/dt
a b c
Fig.3. The experimental signal oscillogramms.
CONCLUSIONS
The investigation of the programmed current
source for the beam scanning system has shown the
possibility of flexible regulation of characteristics of
electron beams at a linac exit.
REFERENCES
[1] A.N.Dovbnya, et al. The Output Beam Scanning and
Forming in the Multipurpose Electron Accelerators of
KIPT/ VANT,Series: Nucleic Physics, 1997, vol 1(28).
p. 114-121.
[2] V.N.Boriskin et al. The linac beam scan with the
correction of irradiation field/ VANT,Series: Nucleic
Physics, 1997, vol 1(28). p. 14.
[3] V.N.Boriskin et al.The development and study of the
forming current devices in the scanning magnet on the
linac exit/ VANT,Series: Nucleic Physics, 1997, vol
2,3(29,30), p. 168-169.
ВОПРОСЫ АТОМНОЙ НАУКИ И ТЕХНИКИ. 1999. №3.
Серия: Ядерно-физические исследования. (34), с. 64-65.
64
CONCLUSIONS
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